Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax payable as an unrecognized tax benefit	$ 1.3
Interest Expense For Unrecognized Tax Position	(0.4)	$ 0.2
Unrecognized Tax Benefits	$ 1.3	$ 3.4